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The twilio.js Library: Twilio in the Browser

Twilio.js allows you to establish audio connections between a web browser and a
Twilio Application. This means you can open inbound and outbound audio
connections to Twilio for building soft phones, walkie-talkies, conference
calls, click-to-talk systems, and more, all from the browser.

When you include the twilio.js library in a web page you get access to a few
objects:

You should choose to load the twilio.js library over the same protocol (HTTP
or HTTPS) that you are using to serve the page. Using a protocol relative
URL, as we do in the above example, will automatically load the content over
the correct protocol.